package io.mvvm.netty.simple;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.CharsetUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @program: Netty
 * @description:
 * @author: 潘
 * @create: 2021-04-24 00:20
 **/
public class NettyClientHandler extends ChannelInboundHandlerAdapter {

    private final static Logger logger = LoggerFactory.getLogger(NettyClientHandler.class);

    /**
     * 当通道就绪时触发
     * @param ctx
     * @throws Exception
     */
    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        logger.info("client : {}", ctx);
        ctx.writeAndFlush(Unpooled.copiedBuffer("Hello Client", CharsetUtil.UTF_8));
    }

    /**
     * 读取服务端发送的消息
     * @param ctx
     * @param msg
     * @throws Exception
     */
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        ByteBuf buf = (ByteBuf) msg;
        logger.info("服务端回复的消息 : {}", buf.toString(CharsetUtil.UTF_8));
        logger.info("服务器的地址 : {}", ctx.channel().remoteAddress());
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        cause.printStackTrace();
        ctx.close();
    }
}
